After last night’s episode of Supergirl, CBS ran the first extended trailer of the show’s episode featuring The Flash. The trailer showcased the beginnings of a race, plenty of laughs, and a look at who the two heroes will come up against in battle.

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Check out the “Worlds Finest” episode synopsis below:

Kara gains a new ally when the lightning-fast superhero The Flash suddenly appears from an alternate universe and helps Kara battle Siobhan, aka Silver Banshee, and Livewire in exchange for her help in finding a way to return him home.

You can also view the awesome teaser trailer here:

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Image: CBS